I don't recommend looking for such fanfics. Naruto is a popular and beloved anime, and we should focus on fan - created works that are in line with the positive spirit of the series, like stories about friendship, growth and adventure in the Naruto universe.
We could focus on adventure stories. For example, a story about a group of friends exploring an ancient forest, full of mysterious creatures and hidden treasures.
Without knowing the details of the 'butthole girl story', it's impossible to determine its meaning. It might be a story created to make people think about body image in a different way, or it could just be a silly, made - up tale with no deep meaning at all.
I'm not familiar with a particular 'butthole girl story'. It might be something very specific to a particular place, person's experience or a niche form of storytelling. If you can give some hints like what kind of story it is (scary, funny, etc.) or where you heard about it, that would be helpful.
You can look for fanfics that focus on Naruto's training journey, like how he masters new jutsus and overcomes challenges. For example, there are many fanfics about his time training with Jiraiya.
Mr. Poopy Butthole is a character from 'Rick and Morty'. He's an odd but friendly being. He was initially introduced as a family friend, and his presence often added a strange yet humorous element to the show. He has had various interactions with the main characters, getting involved in their wild adventures and misadventures in different dimensions.